Which tactical mission task involves sealing off an enemy from sources of support?

• A. Neutralize
• B. Isolate
• C. Secure
• D. Retain

Answer: (B)

The tactical mission task that involves sealing off an enemy from sources of support is isolation. This task is crucial in operations to limit the enemy's access to reinforcements, resupply, or any other forms of support, thereby weakening their ability to resist or counterattack. By effectively isolating the enemy, forces can create a strategic advantage that allows them to engage with reduced risk and increased efficacy.

In contrast, neutralizing typically refers to rendering enemy capabilities ineffective, often through direct engagement. Securing involves holding a position or area, which does not inherently include cutting off support. Retaining involves maintaining control over a specific objective or territory, which also does not focus on denying the enemy's access to outside support. Thus, the nuances of isolation specifically target the strategic goal of disconnecting the enemy from its resources, making it the most appropriate choice in this context.